Vat dye.



TED STATES PATENT OFFICE.

PAUL THOMASCHEWSKI, 0F VOHWINKEL, NEAR ELBERFELD,- GERMANY, ASSIGNOR TOFARBENFABRIKEN VORM. FRIEDR. BAYER & 00., 0F ELBERFELD, GERMANY, A

CORPORATION OF GERMANY.

Patented Oct. 21, 1913.

VAT DYE.

1,076,329, Specification of Letters 1 atent.

No Drawing.

(A being an anthraquinon radical containing the sulfur substituted inthe 2-2-positions and the nitrogen in the 1-1-positions) which arevaluable vat dyestuffs, can be obtained by condensing ortho-halogenizedaminoanthraquinones with anthraquinone niercaptans or by condensingo-rtho-aminoanthraquinoiie-mercaptans with halogenized anthraquinonesand oxidizing if necessary the resulting products. The new compounds arefrom violet to blue crystalline powders soluble in quinolin generallyWith a blue coloration. They dissolve in concentrated sulfuric acid witha green coloration and dye cotton from the hydrosulfite vat from violetto blue fast shades.

In order to illustrate the new process more fully the following exampleis given, the parts being by weight:A mixture of 6 parts ofl-amino-2-broinoanthraquinonc, 5 parts of authraquinone-Qanercaptan and2 parts of CO K is heated to boiling with 80 parts of nitrobenzeneduring 6 hours. The dye is filtered oil", washed with alcohol and waterand dried. It crystallizes from quinolin in the shape of blue needles.It dyes cotton reddish-blue shades. It has the following graphicallyrepresented formula Application filed August 22, 1912. Serial No.716,472.

I claim The herein described diant-hraquinonylth aziiis having mostprobably the formula:

in which formula A represents anthraquinone radicals substituted bysulfur in the 2- 2,-positions and by the nitrogen in the 1-1'- positionswhich are from violet to blue crystalline powders soluble in quinolingenerally with a blue coloration; being soluble in concentrated sulfuricacid with a green coloration; and dyeing cotton from the hydrosulfitevat fast blue shades, substantially as described.

2. The herein described dianthraquinonylthiazin having the followinggraphically represented formula:

co 00 y s i co co V which is a blue crystalline powder soluble inquinohn, soluble in concentrated sulfuric acid with a green coloration,and dyeing cotton reddish-blue shades, substantially as described.

In testimony whereof I have hereunto set my hand in thepresence of twosubscribing witnesses.

PAUL THOMASCHEWSKI.

Witnesses I'IELEN NUFER, A'Lunirr NUFER.

